[1]Nyborg M,Malhi S S.Effect of zero and conventional tillage on barley yield and nitrate nitrogen content,moisture and temperature of soil in north-central Alberta[J].Soil & Tillage Research,1990,15:1-9. [2]Malhi S S,O’Sullivan P A.Soil temperature,moisture and penetrometer resistance under zero and conventional tillage in central Alberta[J].Soil & Tillage Research,1990,17:167-172. [3]Li L L,Huang G B,Zhang R Z,et al.Effects of conservation tillage on soil water regimes in rainfed areas[J].Acta Ecologica Sinica,2005,25(9):2326-2332. [4]Shinners K J,Nelson W S,Wang R.Effects of residue-free band width on soil temperature and water content[J].Transaction of the ASAE,1993,37:39-49. [5]Van Wijk W R,Larson W E,Burrows W C.Soil Temperature and the early growth of corn from mulched and unmulched soil[J].Soil Science Society of America Journal,1959,23(6):428-434. [6]Hamme J E.Long-term tillage and crop rotation effects on bulk density and soil impedance in northern Idaho[J].Soil Science Society of America Journal,1989,53:1515-1519. [7]Osunbitan J A,Oyedele D J,Adekalu K O.Tillage effects on bulk density,hydraulic conductivity and strength of a loamy sand soil in southwestern Nigeria[J].Soil & Tillage Research,2005,82:57-64. [8]Ferreras L A,Costa J L,Garcia F O,et al.Effect of no-tillage on some soil physical properties of a structural degraded Petrocalcic Paleudoll of the southern “Pampa”of Argentina[J].Soil & Tillage Research,2000,54:31-39. [9]Lin G,Wu J,Liu J,et al.Impact of conservation tillage on some soil physical properties and soybean yields(Glycine max?L.Merrill)[J].Soybean Science,2010,29(2):238-243. [10]林蔚刚,吴俊江,董德健,等.初期保护性耕作和秸秆还田对土壤物理特性及大豆玉米产量的影响[J].大豆科学,2010,29(5):761-766.(Lin W G,Wu J J,Dong D. J,et al.Impact of initial conservation tillage and stubble retention on soil physical properties,soybean(Glycine max?L.Merrill)and corn(Zea mays?L.)yield performances[J].Soybean Science,2010,29(5):761-766.) [11]Qin R J,Stamp P,Richner W.Impact of tillage on maize rooting in a Cambisol and Luvisol in Switzerland[J].Soil & Tillage Research,2006,85:50-61. [12]Varsa E C,Chong S K,Abolaji J O,et al.Effect of deep tillage on soil physical characteristics and corn(Zea mays?L.)root growth and production[J].Soil & Tillage Research,1997,43:219-228. [13]孙广玉,张荣华,黄忠文.大豆根系在土层中分布特点的研究[J].中国油料作物学报,2002,24(1):45-47.(Sun G Y,Zhang R H,Huang Z W.Soybean root distributions in meadow-blackland and albic-soil[J].Chinese Journal of Oil Crop Sciences,2002,24(1):45-47.)